Gemini 501-B User Manual
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Contents
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2.1.0 IntroductionThe Gemini 501-B Smoke Detector Analyzer/Aerosol Generator is an instrument ideally suited to measurethe sensitivity response of installed smoke detectors. The Generator produces an aerosol with particles sizecharacteristics resembling fire smoke. The range of concentration, between 0 and 45 mg/m3 or from 0 to 4%/ft obscuration (UL-268), is sufficient to trigger the alarm thresholds of all UL-approved ionization andphotoelectric smoke detectors.The calibration reading for each instrument represents both the UL-268 obscuration standard in (%/ft) and toaerosol mass concentration in (mg/m3). The calibration reading on the LCD allows the operator to determine thesensitivity of the detector and compare it to the range specified by the manufacturer as printed on the back ofeach detector.The instrument can save a considerable amount of time for inspection personnel who must remove detectorsfrom ceiling positions for periodic cleaning or testing. Using the hose, wands, and shroud, test smoke isdelivered to the detector without removing it from the ceiling. From the test results, inspectors can decidewhether to remove the detector for cleaning or sensitivity adjustment.The current NFPA 72 Fire Alarm Code (1996) recommends sensitivity inspection of installed detectors withinone year after installation and every alternate year thereafter.2.0 SpecificationsAerosol CharacteristicsParticle sizeNumber median diameter......................... 0.2 micrometer (um)Mass median diameter ............................. 0.45 umRepeatability............................................. ± 5 %Generation CharacteristicsTest stream flow rate ................................ 60 L/min.Aerosol flow rate....................................... 0 - 4.2 L/min.Concentration RangeAdjustable................................................. 0 - 40 mg/m3 (0 - 4 %/ft obscuration)Reset, concentration ................................ ±4%Type of aerosol......................................... RudolTM Oil *Operating temperature ............................. 24 ±3°C (75 ±5°F)Mechanical CharacteristicsDimensions, overall .................................. 9.5 x 6.5 x 7 in. (24.1x 16.5 x 17.8 cm)Weight, approximately .............................. 11 lb. (5.0 kg), with batteryHose length .............................................. 5 ft. (1.5 m)Oil Reservoir Volume ..................................... approx. 30 mlPower Requirement ....................................... 12 V DC, 6.5 Amp-Hr Ni-MH Battery-------------------*RUDOL oil, a NF-grade white mineral oil, aromatics-free, saturated aliphatic hydrocarbons. Viscosity = 29 centistokes @40 C. Specificgravity = 0.87 @25 °C. RUDOL is a registered trademark of Witco Chemical Corp. It conforms to the FDA-CFR 172.878,which allows for direct skin & food contacts and stabilized with Vitamin E for long shelf life. |
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